What kind of eggs have you got in? and sorry about you losing your birds :( had a similar thing happen with mine, had so many birds of prey this year which has never really been a problem before.
I've been telling myself that this will be the last time I hatch for the year the last 2 hatches, but i'm weak and i set 30 eggs a few days ago due the 1st of August, 12 RIR, 6 light brahma, 6 mixed silkie and 6 silver partridge sablepoot! Given most the eggs to broodys due to awful luck with...